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High Prevalence of Dysplastic Development of Sacral Vertebral Arches in Pediatric Enuresis
Hideo Ozawa,Takakuki Shibano,Isao Tanaka,Toshitaka Taniguchi,Michael B. Chancellor,Naoki Yoshimura 대한배뇨장애요실금학회 2023 International Neurourology Journal Vol.27 No.2
Purpose: This is the first report to compare 3-dimensional computed tomography (3D-CT) images between pediatric patients with enuresis and children without lower urinary tract symptoms who underwent pelvic CT for other reasons. Methods: Forty-seven children (33 boys and 14 girls) with primary enuresis underwent 3D-CT of sacrococcygeal bones. The control group consisted of 138 children (78 boys and 60 girls) who underwent pelvic CT for other reasons. First, we determined the presence or absence of unfused sacral arches at the L4-S3 levels in both cohorts. Subsequently, we compared the fusion of sacral arches in age- and sex-matched children from these 2 groups. Results: Dysplastic sacral arches, characterized by lack of fusion at 1 or more levels of the S1–3 arches, were observed in nearly all patients in the enuresis group. In the control group (n=138), 54 of 79 children over 10 years old (68%) exhibited fused sacral arches at 3 S1–3 levels. All 11 control children under 4 years old displayed at least 2 unfused sacral arches at the S1–3 levels. In a comparative study of age- and sex-matched patients with enuresis and control children aged 5 to 13 years (n=32 for each group, with 21 boys and 11 girls; mean age, 8.0±2.2 years [range, 5–13 years]), only 1 patient (3%) in the enuresis group exhibited fusion of all S1–3 arches. In contrast, 20 of 32 control group participants (63%) had 3 fused sacral arches (P<0.0001). Conclusions: Sacral vertebral arches typically fuse by the age of 10 years. However, in this study, children with enuresis exhibited a significantly elevated prevalence of unfused sacral arches, suggesting that dysplastic development of sacral vertebral arches may play a pathological role in enuresis.
Toshihiro Tabata,Hideo Taniguchi 보안공학연구지원센터 2008 International Journal of Hybrid Information Techno Vol.1 No.1
Processes can be executed concurrently in operating systems; they can be created dynamically and then terminate, i.e. process creation and termination are required for program execution. However the costs involved in process creation and termination make this procedure expensive. This procedure expensive, thus degrading the performance of program execution. To solve this problem, a fast process creation and termination mechanism is proposed. This mechanism is implemented by recycling process resources. In order to improve the efficiency of recycling, the management of preserved process resources for recycling is an important factor. In this paper, we propose an improved resource management method for recycling process resources and an adaptive control mechanism. In the method, only one process resource with a program image is preserved for each program that occurs with high frequency of program execution. The proposed method can reduce the amount of memory consumption for preserved process resources in a concurrent execution environment. We also describe the implementation of the proposed method on the Tender operating system and report the results of our experiments.
Flow Visualization of Flowfield Structures around an Aerospike Nozzle using LIF and PSP
Tomohide NIIMI,Hideo MORI,Mashio TANIGUCHI 한국가시화정보학회 2004 KOREA-JAPAN Joint Seminar on Particle Image Veloci Vol.- No.-
Aerospike nozzles have been expected to be used for an engine of a reusable space shuttle to respond to growing demand for rocket-launching and its cost reduction. In this study, the flow field structures in any cross sections around clustered linear aerospike nozzles are visualized and analyzed, using laser induced fluorescence (LIF) of nitrogen monoxide seeded in the carrier gas of nitrogen. Since flow field structures are affected mainly by pressure ratio, the clustered linear aerospike nozzle is set inside a vacuum chamber to carry out the experiments in the wide range of pressure ratios from 75 to 200. Flow fields are visualized in several cross-sections, demonstrating the complicated three-dimensional flow field structures. Pressure sensitive paint (PSP) ofPtTFPP bound by poly-IBM-co-TFEM is also applied to measurement of the complicated pressure distribution on the spike surface, and to verification of contribution of a truncation plane to the thrust. Finally, to examine the effect of the sidewalls attached to the aerospike nozzle, the flow fields around the nozzle with the sidewalls are compared with those without sidewalls.
A CPU Usage Control Mechanism for Processes with Execution Resource for Mitigating CPU DoS Attack
Toshihiro Tabata,Satoshi Hakomori,Kazutoshi Yokoyama,Hideo Taniguchi 보안공학연구지원센터 2007 International Journal of Smart Home Vol.1 No.2
In a ubiquitous environment, the hardware resources are limited; thus, an appropriate resource management mechanism is required for guaranteeing its processing activity. However, most operating systems (OSs) lack an access control mechanism for CPU resources to guarantee satisfactory processing and to safeguard the system from malicious attacks that affect the CPU resources, resulting in denial of service (DoS). Access control is not intended for CPU resources, which are important for the execution of a program. As a result, OSs cannot control the usage ratio of CPU resources. In this paper, we propose an access control model for CPU resources based on an execution resource. The proposed model can control the usage ratio of CPU resources appropriately for each user and each program domain. This execution resource can be applied to mitigate DoS attacks. In order to evaluate the effectiveness of the proposed method, we describe the results of a basic performance experiment and a DoS simulation experiment employing the Apache web server. From the results, we show that the proposed method can mitigate DoS attacks and does not have bad effects upon the performance of a target service.